<html>
<head>
    <title>websocket测试</title>
    <meta charset="utf-8"/>
</head>

<body>
<button onclick="sendMessage()">测试</button>
<script>
    let socket = new WebSocket("ws://localhost:9090/ws");
    socket.onerror = err => {
        console.log(err);
    };
    socket.onopen = event => {
        console.log(event);
    };
    socket.onmessage = mess => {
        console.log(mess);
    };
    socket.onclose = () => {
        console.log("连接关闭");
    };

    function sendMessage() {
        if (socket.readyState === 1) socket.send("这是一个测试数据");
        else alert("尚未建立websocket连接");
    }
</script>
</body>
</html>